Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3e3b64371ed316…

MALICIOUS

PDF

90.8 KB Created: 2021-07-18 00:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbaab6a0cbe704ccba8e89c8bbb2dee0 SHA-1: 65ec27c770c14752fbea295558fb46f40fe1640f SHA-256: cd3e3b64371ed3166ec3eb1706ff467512dce1553a13e8960beb57ceb0519fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://amrapalispot.com/userfiles/file/64543675962.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a10bebbe1a9159cc583c61a9dfc2fc58/fakakulejimemixige.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/63431907359.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/vefarekojur.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5727de96b---42522084298.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/11467751677.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/18400693967.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rnchkt7sa4cgnd52i9q99t7nf0/kipidasanubi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0f0664297590de0a3b05f6f1a38f080f/sogojipekov.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3568311023.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab651309f---pimejasixodixelob.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/38220165315.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/40642497001.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/83265416332.pdfIn PDF document text
    • https://protrialse.eu/files/files/67393693074.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef81893c4---41667569117.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dunibefakuja.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc9716b4f---58601906649.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/lirox.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k3p6vnmrisn72b5040sio5pk81/22275385638.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1f4e4b14bf9439fc97ef983f339304a9/73238814053.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cu2c7e85fco92b7sbadmass6s3/83098627.pdfIn PDF document text
    • http://sciattella.net/images/file/39903112819.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/dumupijelagikapaxiluku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+fade+a+sound+in+garagebandPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 10800 bytes
SHA-256: b8d275ba6b10503608b090e49cd8ff2d192797bf8d320cf2d0e8052e53fd2e00
font_02_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 16336 bytes
SHA-256: 0088b6e72ea18441fb1c975846ba4809cf83e2a233ad5d291f8f5b780843d6d7
font_03_sfnt_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 17700 bytes
SHA-256: ceeb030375cecd80a7aa222e4a722ce9f8bee5cd4e64cf50700eea3fcbb2d6ec

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